Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual condado tem uma renda per capita de $51,456?
 ###Tabelas: CREATE TABLE counties (counties_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT) CREATE TABLE league_championship_series (league_championship_series_id AUTO_INCREMENT PRIMARY KEY, Year INT, Series VARCHAR, Winning team VARCHAR, Losing team VARCHAR, Score VARCHAR, Site VARCHAR) CREATE TABLE major_dams_and_reservoirs (major_dams_and_reservoirs_id AUTO_INCREMENT PRIMARY KEY, Dam constructed VARCHAR, Year completed INT, Impounded body of water VARCHAR, Reservoir capacity VARCHAR, Dam wall height VARCHAR, Dam type VARCHAR) CREATE TABLE switchers_s_series (switchers_s_series_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Specification VARCHAR, Build date VARCHAR, Total produced INT, Wheel arrangement VARCHAR, Prime mover VARCHAR, Power output VARCHAR) CREATE TABLE regular_season_schedule (regular_season_schedule_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Home Team VARCHAR, Score VARCHAR, Visiting Team VARCHAR, Stadium VARCHAR)  
SELECT County FROM counties WHERE Per capita income = $51,456